blazer rookie questions

[Walter White]

recently got a 72 that has mostly new sheet metal and pretty good condition.
with top on, driver door (donated from 70 pick up) gap is too close. with top off, the door rubs a little. i jacked cab frame a little and it seemed to open the gap. how difficult is replacing old body mounts?
truck was originally white/white but i would rather goto medium blue--is that a bad move? gotta paint jams anyway as PO painted entire. looks like primer but he assured me its paint. he did no prep so I'm sanding it all off.
anybody know what late model seats from big suv would bolt in nicely or should i reupholster.
will reply from phone to get picks in